David K. Joyce

Downs Collection, Minerals of the Apatite Supergroup

I am pleased to offer the mineral collection of Dr. Robert T. Downs for sale, here on the website. Dr. Downs was born and raised in Canada and lived in many places across the country. Since a boy he was interested in minerals and mineralogy and has had several mineral collections over the years. Bob was a “late starter” and, after many years working on major construction projects as a supervisor and surveyor In British Columbia and the Yukon, he finally completed a degree in mathematics at the University of British Columbia, at the age of 30. Subsequently, he completed a masters degree and then a PhD in Mineralogy and Mathematics at Virginia Polytechnic. All through his life, he collected and studied minerals and was especially good at field collecting fine and interesting mineral crystal specimens. After post-doctoral studies at the Geophysical Lab in Washington, DC, he accepted a professorship at the University of Arizona, in Tucson. He has contributed much to the world of crystallography and mineralogy over the years, in the field of crystal structures, the RRUF project, supervision of dozens of masters and PhD students, as founding curator of the New Alfie Norville Gem and Mineral Museum in Tucson and in remote sensing and mineralogical analysis for extra terrestrial missions.
The Downs collection reflects his interests over the years, particularly with the Apatite Group of minerals, fluorapatite, vanadinite, mimetite, pyromorphite, etc. As well , other specimens are some very good personally collected specimens from Southern Arizona. There are a number of other pieces that just intrigued Bob for various reasons. Here are some of his mineral specimens.

This page will show excellent specimens of Fluorapatite, mimetite, vanadinite, pyromorphite, etc., that Dr. Downs found interesting.

All prices in Canadian dollars. For payment in US$, deduct 18% or multiply by 0.82.

Click on any of the following thumbnails to view a larger image of the specimen.

Fluorapatite, MuscoviteDowns Collection, Minerals of the Apatite Supergroup
  • Item #27855
  • Fluorapatite, Muscovite
  • 5.1x2.7x2.8 cm
  • Largest Crystal Size: 31mm
  • $220.00
  • Jaguaracu Pegmatite
  • Jaguaracu, Minas Gerais
  • RTD An elongated cluster of doubly terminated, dark green fluorapatite with some small muscovite crystals from this famous pegmatite. The fluorapatite crystals are very well formed prisms terminated by a pinacoid and two pyramids. Nicely mounted on an acrylic base for display. Well above average for this pegmatite!!
FluorapatiteDowns Collection, Minerals of the Apatite Supergroup
  • Item #27856
  • Fluorapatite
  • 7.3x4.3x4.0 cm
  • Largest Crystal Size: 57mm
  • $250.00
  • Sapo Mine
  • Goiabeira, Minas Gerais
  • RTD The Sapo Mine is famous for the peculiar, stepped and elongated crystals of fluorapatite such as these. A one-time find m10, or so, years ago, yielded a number of fine specimens such as this one. Oddly, some of the crystals are hollow and most are terminated by a pinacoid and one pyramidal form. Very light green. Sits JUST like this for display.
FluorapatiteDowns Collection, Minerals of the Apatite Supergroup
  • Item #27831
  • Fluorapatite
  • 3.9x2.6x2.4 cm
  • Largest Crystal Size: as above
  • $975.00
  • Shengus Mine
  • Gilgit-Baltistan
  • RTD This amazing fluorapatite crystal is a single crystal with some stepped growth. It is a short hexagonal prism, terminated by first and second order pyramid forms. The crystal is largely gemmy, with some cloudiness near the middle portions. Near the bottom, there are small amounts of some very fine inclusions of what is probably fine, fibrous byssolite inclusions and some tiny, green, platy crystals of what is probably chlorite. Excellent example of this mineral with no colouring impurities!
MimetiteDowns Collection, Minerals of the Apatite Supergroup
  • Item #27833
  • Mimetite
  • 6.3x3.6x3.5 cm
  • Largest Crystal Size: 11mm
  • $280.00
  • Pingtouling Mine
  • Liannan, Guandong
  • RTD An interesting and unusual mimetite! The crystals on this specimen are capped with a lustrous, sharp pinacoidal termination while the prism faces are stepped, sort of skeletal in form. Orangey crystals on solid, iron oxides matrix. Displays very well, just as shown.
VanadiniteDowns Collection, Minerals of the Apatite Supergroup
  • Item #27984
  • Vanadinite
  • 4.4x3.8x2.7 cm
  • Largest Crystal Size: 20mm
  • $65.00
  • Touissit
  • Bou Beker
  • RTD A cluster of very large, beige, vanadinite crystals from this famous area of Morocco. The crystals show hexagonal outline with flat terminations. Dense!!
PyromorphiteDowns Collection, Minerals of the Apatite Supergroup
  • Item #27996
  • Pyromorphite
  • 2.5x2.3x1.7 cm
  • Largest Crystal Size: 11mm
  • $210.00
  • Les Farges Mine
  • Ussel
  • RTD A wonderful cluster of barrel-shaped pyromorphite crystals with that peculiar green colour typical of pyromorphite from Les Farges. The cluster looks great and is an excellent example!
Fluorapatite, AlbiteDowns Collection, Minerals of the Apatite Supergroup
  • Item #28000
  • Fluorapatite, Albite
  • 4.9x1.8x1.7 cm
  • Largest Crystal Size: 6mm
  • $45.00
  • Foote Mine
  • Cleveland County
    North Carolina, USA
  • RTD Really nice crystals of pinkish fluorapatite showing a tiny prism face and the morphology dominated by the pyramid. Unusual for apatite!! Interesting!
Wulfenite, MimetiteDowns Collection, Minerals of the Apatite Supergroup
  • Item #28004
  • Wulfenite, Mimetite
  • 5.3x5.1x2.9 cm
  • Largest Crystal Size: w-5mm
  • $65.00
  • Ojuela Mine
  • Mapimi, Durango
  • RTD Loads of botryoidal, green mimetite and prismatic, yellow-orange wulfenite crystals all over this piece. Some bruising but still looks great and a nice association piece!
FluorapatiteDowns Collection, Minerals of the Apatite Supergroup
  • Item #28005
  • Fluorapatite
  • 3.6x2.1x1.6 cm
  • Largest Crystal Size: as above
  • $65.00
  • Aldeia Do Eme
  • Conselheira Pena, Minas Gerais
  • RTD A unique extremely hoppered fluorapatite crystal from this pegmatite deposit. Hoppered growth like this is usually caused by very rapid crystal growth. Excellent example!